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Finding the Fourth Proportional to 8,855.68, 12,212.96 and 6,989.44

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Solution

The fourth proportional to 8,855.68, 12,212.96 and 6,989.44 is: 9,639.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,855.68 : 12,212.96 = 6,989.44 : x
  2. Step 2: Convert to fraction form
    8,855.68/12,212.96 = 6,989.44/x
  3. Step 3: Cross multiply
    8,855.68x = 12,212.96 × 6,989.44
  4. Step 4: Simplify right side
    8,855.68x = 85,361,751.14
  5. Step 5: Solve for x
    x = 85,361,751.14/8,855.68
  6. Step 6: Final answer
    x = 9,639.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.